Panoramic X-ray Apparatus Chair Movement Control
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Solution Overview
Problem
The existing medical X-ray CT photography apparatus lacks clear details on how to perform panoramic X-ray photography, specifically regarding the movement of the X-ray generator and detector relative to the subject during panoramic imaging.
Innovation Solution
A medical X-ray CT photography apparatus is designed with a support system that includes a turning shaft, a chair moving mechanism, and a control part to facilitate panoramic X-ray photography by linearly moving the subject chair relative to the support and adjusting the position of the X-ray detector, ensuring the subject is irradiated from both sides of the dental arch while maintaining a constant projection scaling factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the subject chair is linearly moved relative to the support during panoramic X-ray photography, then the panoramic imaging can be performed effectively, but body movement of the subject may occur affecting image quality
Solution Approach 1:
Instead of moving the X-ray generator and detector around a fixed subject (conventional approach), the patent inverts the approach by moving the subject chair linearly relative to the support structure. This allows panoramic imaging to be achieved while the subject moves through the imaging zone, effectively performing panoramic X-ray photography without requiring complex rotational mechanisms around the subject.
2Adaptability or versatility
If the X-ray generator and detector are moved relative to the subject for panoramic photography, then panoramic imaging is achieved, but the device configuration becomes complex
Solution Approach 1:
The patent merges the subject positioning function with the panoramic imaging function by integrating the chair moving mechanism into the support structure. The support structure not only holds the X-ray generator and detector but also provides the linear movement capability for the subject chair, combining multiple functions into a unified system that reduces overall complexity.
Solution Approach 2:
The support structure serves itself by incorporating the chair moving mechanism directly into its design. Rather than requiring separate complex mechanisms for subject positioning and imaging, the support structure provides both functions, with the linear movement capability serving both positioning and panoramic imaging purposes simultaneously.
3Adaptability or versatility
If the subject is irradiated from both sides of the dental arch for panoramic photography, then complete dental coverage is achieved, but the projection scaling factor varies requiring complex arithmetic corrections
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-positioning the chair movement trajectory to compensate for scaling variations. The chair moving mechanism is controlled to follow a specific path that anticipates and corrects for projection scaling changes before they occur, ensuring consistent image geometry throughout the panoramic sweep without requiring post-processing corrections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for effective panoramic X-ray photography with improved image quality by stabilizing the subject's position and maintaining a consistent projection scaling factor, reducing the need for complex arithmetic corrections.
Implementation Method 1
an X-ray generator and an X-ray detector which are opposed to each other with a subject interposed therebetween, the X-ray generator emitting an X-ray beam, the X-ray detector outputting an electric signal according to an intensity of a detected X-ray
Data Source
AI summary
A medical X-ray CT photography apparatus body includes a turning arm that supports an X-ray generator and an X-ray detector while the X-ray generator and the X-ray detector are opposed to each other with the subject interposed therebetween, a bracket part that fixedly supports an axial center position of a turning shaft provided in the turning arm, and a support drive part that turns the turning arm about the turning shaft with respect to the bracket part. The medical X-ray CT photography apparatus body also includes a subject chair on which the subject sits, a chair moving mechanism that linearly moves the subject chair in a front-back direction (Y-axis direction) of the subject, and a main-body controller that performs the panoramic X-ray photography by controlling the chair moving mechanism and the support drive part in conjunction with each other.